<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表格合并</title>
</head>
<body>
    <table align="center" border="1" width="500" height="500" cellspacing="0">
        
            <tr>
                <td></td><td></td><td></td>
            </tr>
    
            <tr>
                <td></td> <td colspan="2"></td> <!--<td></td> -->
            </tr>
    
            <tr>
                <td></td> <td></td> <td></td> 
            </tr>
    
    </table>
</body>
</html>